1.
2. Looking back Huisgen was not happy about the choice of the name because it may be misleading. The name 1 3-dipole may imply high dipole moments of these compounds which is not the case for many 1 3-dipoles.
3. In the first reviews (e.g. in ref. [33]) reactions of 1 3-dipoles without octet stabilization were included for instance those of keto carbenes. Later it was recognized that they are better regarded as 2π components in cycloadditions.